Abstract
Summary Nitrogenous fertilizer (NH4NO1) and insecticides were applied to 8 plots of young Eucalyptus grandis and E. dunnii established in a 2 × 2 factorial design. Growth rates of saplings were significantly enhanced by the administration of fertilizer (P≤0.05) but were affected to a lesser degree by insecticides (P>0.05). Twenty six weeks after planting, trees receiving both treatments were, on average, a third taller than the control trees. In the presence of an outbreak of psyllids (Cardiaspina fiscella and C. maniformis) mean height and diameter (DBHOB) of E. dunnii was greater than for E. grandis. The application of insecticide reversed this trend. Both species of psyllid were almost entirely restricted to the E. grandis saplings. The fertilizer did not appear to affect the level of psyllid infestation.
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